Abstract
The purpose of the study is to protect the safety of the submarine pipelines by establishing and analyzing mechanical model of the overhanging pipeline. The calculation equations of the force and deformation of the overhanging pipeline are presented in this study. In especial, the transition section is introduced to analyze the overhanging oil pipeline. The calculation equations of the moment, stress and deformation of the overhanging pipeline by considering the premise of sediment reaction are created. The software FORTRAN is used to carry out numerical simulation and the changing laws of bending moment, stress and deformation of overhanging pipeline are obtained. On the basis, the calculation equations of maximum bending moment, maximum stress and maximum deformation can be also obtained. Therefore, theoretical support for calculating submarine pipelines is provided, which has great significance for the analysis and treatment of the overhanging of submarine pipelines.
Highlights
Submarine pipeline is an important component part of the production system in offshore oil field, protecting the safety of the submarine pipelines is an important part of guaranteeing safe production and the protection of the Marine environment (Zhao et al, 2006)
If σ is between σ-1 and σs, the pipeline material is in a limited lifetime and fatigue damage will be appeared
If σ is greater than σs, the pipeline material is in a limited lifetime and static strength damage will be appeared
Summary
Submarine pipeline is an important component part of the production system in offshore oil field, protecting the safety of the submarine pipelines is an important part of guaranteeing safe production and the protection of the Marine environment (Zhao et al, 2006). In order to determine whether the pipeline is safe or not, it is necessary to establish an analysis model of the overhanging pipeline and calculate the stress (Wang et al, 2004; Deng et al, 1998). The stress distribution, vortex induced vibration, nonlinear vibration and fatigue life of the overhanging pipeline are studied using clamped or supported boundary conditions by many scholars at home and abroad, but the transition length can not be considered. Through the stress analysis of submarine oil pipeline, the gradient forces processed by the support of sediment to pipeline are applied on pipeline; mechanical model of the overhanging pipeline is created in this study. The bending moment, stress and deformation calculation equations of the overhanging pipeline are established in the premise of considering the transition section, theoretical support is provided for the calculation of submarine overhanging pipelines. The purpose of this study is to protect the safety of the submarine pipelines by establishing and analyzing mechanical model of the overhanging pipeline
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